If you have already own or plan to purchase the EnviroAlert Wireless Environmental Monitor and Alert System Base Unit you can use this Multi-Function Wireless Sensor Transmitter to send wireless data from compatible hard-wired sensors back to your base unit. Using wireless transmissions you can eliminate the need for long wire runs from a hardwired sensor all the way back to your base unit. This reduces costly and difficult installations. With an adjustable antenna for optimal signal acquisition, wireless transmission can go up to 1000 feet. The Multi-Function Wireless Sensor Transmitter are physically connected to wired sensors located elsewhere and provide a transmitter to send the signals monitored by the wired sensor to the base unit.